"Any four points in space that are not all on the same plane mark the corners of four triangles. The triangles in turn are the faces of a tetrahedron. It's the simplest of all polyhedra--solids bounded by polygons... To sculptor Arthur Silverman of New Orleans, however, tetrahedra are very special. He has been
investigating variations of tetrahedral forms for more than 20 years in sculptures displayed in public spaces in New Orleans and other cities from Florida to California."